Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 40, Pages 11681-11685Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201504758
Keywords
antiferromagnets; cubic aromaticity; metal clusters; metal-organic frameworks; multicenter Mn-I-Mn-I bonds
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Funding
- 973 Program [2012CB821702, 2011CB932401, 2011CB935902]
- NSFC [21421001, 21473121]
- SFC of Tianjin [15JCZDJC37700]
- 111 project [B12015]
- MOE Innovation Team of China [IRT13022, IRT-13R30]
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MOFs with both multicentered metal-metal bonds and low-oxidation-state (LOS) metal ions have been underexplored hitherto. Here we report the first cubic [Mn-8(I)] cluster-based MOF (1) with multicentered Mn-I-Mn-I bonds and + 1 oxidation state of manganese (Mn-I or Mn(I)), as is supported by single-crystal structure determination, XPS analyses, and quantum chemical studies. Compound 1 possesses the shortest Mn-I-Mn-I bond of 2.372 angstrom. Theoretical studies with density functional theory (DFT) reveal extensive electron delocalization over the [Mn-8(I)] cube. The 48 electrons in the [Mn-8(I)] cube fully occupy half of the 3d-based and the lowest 4s-based bonding orbitals, with six electrons lying at the nonbonding 3d-orbitals. This bonding feature renders so-called cubic aromaticity. Magnetic properties measurements show that 1 is an antiferromagnet. This work is expected to inspire further investigation of cubic metal-metal bonding, MOF materials with LOS metals, and metalloaromatic theory.
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